Weight Loss · Wegovy Pill
Wegovy Pill vs Mounjaro UK 2026: Tablet vs Injection, Trial Data & Who Each Suits
In short
They are different medicines. The Wegovy pill is oral semaglutide (a single-hormone GLP-1 medicine); Mounjaro is injectable tirzepatide (a dual GLP-1/GIP medicine). In trials, Mounjaro 15mg averaged ~22.5% weight loss (SURMOUNT-1) versus ~16.6% for the 25mg pill (OASIS 4). Mounjaro tends to show higher average weight loss; the pill offers a needle-free daily tablet. The right choice is a clinical decision.
Wegovy pill vs Mounjaro at a glance
| Factor | Wegovy Pill | Mounjaro Injection |
|---|---|---|
| Format | Daily tablet | Weekly injection |
| Active ingredient | Semaglutide (GLP-1) | Tirzepatide (GLP-1 & GIP) |
| Headline trial result | ~16.6% / 64 wks (OASIS 4, 25mg) | ~22.5% / 72 wks (SURMOUNT-1, 15mg) |
| Needles | None | Yes (weekly) |
| Storage | Room temperature | Refrigerate before use |
| Daily routine | Empty stomach + 30-min wait each morning | One injection weekly, any time |
| Best suited to | Those who want a needle-free daily tablet | Those seeking the highest average weight loss |
Cross-trial comparisons should be interpreted with caution — populations, designs and durations differ. These are averages from separate trials, not a direct head-to-head.
Why Mounjaro tends to show higher average weight loss
Mounjaro mimics two hunger hormones (GLP-1 and GIP); the Wegovy pill mimics one (GLP-1). That dual action is the likely reason Mounjaro’s average trial weight loss is higher. It doesn’t mean Mounjaro is right for everyone — response, tolerability and preference all matter, and plenty of people do very well on semaglutide.
Why some people choose the pill anyway
- No needles — a daily tablet instead of a weekly injection.
- No refrigeration — simpler storage and travel.
- Preference and tolerability — some people simply do better on, or prefer, semaglutide.
Why some people choose Mounjaro
- Highest average trial weight loss of the current options.
- Once-weekly dosing with no daily fasting routine.
- Dual-hormone action that some find gives stronger appetite control.
Side effects compared
Both are GLP-1-based and share a similar gut-related side-effect profile — nausea, diarrhoea, constipation — managed with titration. Mounjaro’s dual action can feel stronger for some. See our side effects guide for how to manage symptoms on the pill.
Cost compared
Pricing is broadly similar across regulated UK providers. At Slinic the Wegovy pill starts from £83/month; see the full cost guide. Cost shouldn’t be the only factor — suitability is a clinical decision your prescriber makes with you.
Switching between them
Moving from Mounjaro to the pill is a bigger change because they’re different molecules, so a washout gap (commonly around 7 days) is usually needed. See our switching guide — and never self-manage a switch. For the same-molecule comparison, see Wegovy pill vs injection.
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Wegovy pill from £83/month · No subscription · GPhC No. 1033729
Frequently asked questions
Is Mounjaro better than the Wegovy pill?
Neither is objectively better. Mounjaro showed higher average weight loss in trials (~22.5% vs ~16.6%), but it is a weekly injection. The pill is needle-free and daily. The right choice depends on your response, tolerability and preference.
What is the difference between the Wegovy pill and Mounjaro?
They are different medicines. The Wegovy pill is oral semaglutide (single-hormone GLP-1); Mounjaro is injectable tirzepatide (dual GLP-1/GIP).
Why does Mounjaro cause more weight loss?
Mounjaro mimics two appetite hormones (GLP-1 and GIP) versus one for semaglutide. That dual action is the likely reason its average trial weight loss is higher.
Can I switch from Mounjaro to the Wegovy pill?
Yes, under prescriber supervision. Because they are different molecules, a washout gap (commonly around 7 days) is usually needed, and your prescriber confirms your starting dose.
Is the Wegovy pill or Mounjaro cheaper?
Pricing is broadly similar across regulated UK providers. At Slinic the Wegovy pill starts from GBP99/month. Suitability, not cost, should drive the choice.
Which has fewer side effects?
Both share a similar gut-related side-effect profile managed with titration. Mounjaro’s dual-hormone action can feel stronger for some people.
References & sources
- Wharton S, Lingvay I, Bogdanski P, et al. Oral Semaglutide 25mg in Adults with Overweight or Obesity (OASIS 4). N Engl J Med 2025;393:1077–1087.
- Wilding JPH, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1). N Engl J Med 2021;384:989–1002.
- Jastreboff AM, et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). N Engl J Med 2022.
- NICE TA875 — Semaglutide for managing overweight and obesity.
- NHS — Semaglutide medicine information.
- GPhC Register — verify Slinic (Reg No. 1033729).
This guide is for general information and does not replace personalised medical advice. Semaglutide is a prescription-only medicine and must be prescribed and supervised by a registered healthcare professional. NHS and NICE status can change — always check the latest guidance. Individual results vary.
